Messages in this thread | | | Date | Tue, 15 May 2018 07:33:57 +0200 | From | Ingo Molnar <> | Subject | Re: [PATCH] x86: add the flag -fno-reorder-blocks-and-partition |
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* Mikulas Patocka <mpatocka@redhat.com> wrote:
> GCC 8 turns on -freorder-blocks-and-partition by default, the ORC unwinder > can't deal with it and it results in a lot of warnings "sibling call from > callable instruction with modified stack frame". This patch adds the > -fno-reorder-blocks-and-partition option to KBUILD_CFLAGS. > > Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> > Cc: stable@vger.kernel.org > > --- > arch/x86/Makefile | 1 + > 1 file changed, 1 insertion(+) > > Index: linux-2.6/arch/x86/Makefile > =================================================================== > --- linux-2.6.orig/arch/x86/Makefile 2018-05-15 07:19:40.000000000 +0200 > +++ linux-2.6/arch/x86/Makefile 2018-05-15 07:19:40.000000000 +0200 > @@ -59,6 +59,7 @@ endif > # > KBUILD_CFLAGS += -mno-sse -mno-mmx -mno-sse2 -mno-3dnow > KBUILD_CFLAGS += $(call cc-option,-mno-avx,) > +KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks-and-partition,)
Could you check whether the latest objtool fixes in -tip:
git git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip.git master
solves those warnings?
Thanks,
Ingo
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